/**
 * @author jianshan@byai.com
 * @date 2021/3/5 3:50 PM
 * describe:
 */
public class IDCardNumber {


    public static void main(String[] args) {

    }

    private static String iDCardNumber(String number){
        String text = number;
        if (text == null || text.trim().length() <= 0 ) {
            return null;
        }
        if (text.trim().length() == 18) {
            return "01";
        }
        if (text.trim().length() == 15) {
            return "02";
        }
        return null;
    }
}
